Palladium catalyst for hydrogenation reaction of 1, 4-butylene glycol and preparation process thereof

Abstract

The invention discloses a palladium catalyst for hydrogenation reaction of 1, 4-butylene glycol and a preparation process of the palladium catalyst, and belongs to the technical field of catalysts. The designed and synthesized palladium catalyst comprises the following raw materials: a modified carrier and a chloropalladic acid solution, the modified carrier is synthesized into magnesium-aluminum hydrotalcite by a hydrothermal method, the magnesium-aluminum hydrotalcite and a metal ion solution are blended for an ion replacement reaction to generate nickel-based hydrotalcite with an intercalation structure, sodium silicate is added into a dispersion liquid of the nickel-based hydrotalcite with the intercalation structure, and the nickel-based hydrotalcite with the intercalation structure is prepared. And finally, performing low-temperature plasma operation to highly disperse the nano silicon dioxide on the surface of the hydrotalcite so as to obtain the modified carrier. The palladium catalyst also contains nickel element, so that the high efficiency of hydrogenation reaction is ensured, and the cost is reduced; meanwhile, a SiO2 inert substance is introduced into the hydrotalcite carrier, so that the reduction is reduced, and the poisoning effect is prevented. Low-temperature plasma is used for loading to generate an alloy structure, so that active components are effectively prevented from being gathered and inactivated.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a palladium catalyst for 1,4-butenediol hydrogenation reaction and a preparation process thereof. Background technique [0002] 1,4-Butenediol (BED) is an important chemical raw material, mainly used as a plasticizer for alkyd resins, a cross-linking agent for synthetic resins and a fungicide, etc. Intermediate, can also be used to make nylon and pharmaceutical products. For a long time, there have been many studies and reports on the selective semi-hydrogenation of alkynes and alkyne derivatives (that is, the products are required to selectively stay in the alkene stage). [0003] So far, it is recognized that Lindlar catalyst has the best effect and is the most widely used. Lindlar catalyst is formed by adsorbing palladium on a carrier (calcium carbonate or barium sulfate) and adding a small amount of inhibitor (lead acetate or quinoline), but the main active component of Lind...

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Problems solved by technology

[0003] So far, it is recognized that Lindlar catalyst has the best effect and is most widely used. Lindlar catalyst is formed by adsorbing palladium on a carrier (calcium carbonate or barium sulfate) and adding a small amount of inhibitor (lead acetate or quinoline), but the active ingredient of Lindlar catalyst is mainly Palladium, the high cost of precious metals, restricts its widespread use in industrial applications

Secondly, in view of the different chemical reactivity on different carrier materials, and the carrier can regulate the ability of the catalyst to absorb the reaction gas, but it often occurs poisoning and is reduced, causing the active metal to be unable to adsorb hydrogen in the catalytic reaction, so choose a suitable carrier to design and synthesize the price Catalysts with moderate, stable catalytic performance and high efficiency are the key step

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